CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Income Statement [Abstract]
Revenues	$ 124,628	$ 114,277	$ 366,139	$ 376,673
Cost of revenues	49,689	51,203	154,317	166,472
Gross profit	74,939	63,074	211,822	210,201
Operating expenses:
Research and development	31,063	36,700	107,939	117,375
Selling, general and administrative	23,687	25,871	77,826	89,864
Total operating expenses	54,750	62,571	185,765	207,239
Operating income (loss)	20,189	503	26,057	2,962
Gain (loss) on divestitures, net	(3,415)	0	78,934	0
Interest income (expense) and other, net	1,108	(344)	1,921	1,450
Income (loss) before income taxes from continuing operations	17,882	159	106,912	4,412
Income tax provision (benefit)	543	265	661	(3,768)
Net income (loss) from continuing operations	17,339	(106)	106,251	8,180
Discontinued operations:
Gain from divestiture	0	0	0	886
Loss from discontinued operations before income taxes	(10,123)	(5,115)	(17,922)	(18,658)
Expense (benefit) from income taxes	268	(64)	(6)	(47)
Income tax provision (benefit)	543	265	661	(3,768)
Net income (loss) from discontinued operations	(10,391)	(5,051)	(17,916)	(17,725)
Net income (loss)	$ 6,948	$ (5,157)	$ 88,335	$ (9,545)
Basic net income (loss) per share - continuing operations (in dollars per share)	$ 0.11	$ 0.00	$ 0.71	$ 0.06
Basic net income (loss) per share - discontinued operations (in dollars per share)	$ (0.06)	$ (0.04)	$ (0.12)	$ (0.13)
Basic net income (loss) per share (in dollars per share)	$ 0.05	$ (0.04)	$ 0.59	$ (0.07)
Diluted net income (loss) per share - continuing operations (in dollars per share)	$ 0.11	$ 0.00	$ 0.70	$ 0.06
Diluted net income (loss) per share - discontinued operations (in dollars per share)	$ (0.07)	$ (0.04)	$ (0.12)	$ (0.13)
Diluted net income (loss) per share (in dollars per share)	$ 0.04	$ (0.04)	$ 0.58	$ (0.07)
Weighted average shares:
Basic	151,018	144,321	148,835	143,477
Diluted	155,035	144,321	152,560	144,760